Frequency changer for short waves



April 12 1927. 1,624,065

M. OSNOS FREQUENCY CHANGER FOR SHORT WAVES Filed Oct. 20. 1925 Fig.1 I 10 2 /lfi/f FREQUENCY SOME! OF AUEB/VATl/VG HEAT/N6 Cl/REZWT HEAT/M9 Cl/KRENT 50l/RCE sou/2c: 0F" may FREQUENCY INVENTOR MENDEL USNOS A TORNEY v Patented Apr. 12,1927.

UNITED STATES PATENT OFFICE. f

rumour. canoe, or Baum, GERMANY, ASSIGNOR 'ro-onsnmzscnm rim nm'rtosn 'rnnnomrnm I. 3. n. inLLEscHEs. or BEBLIN, onnmmr, a conronn'rmn or GEBKANY.

Application fled come; so. 1925, semi no.

My invention relates to inductance tie vices, and, more particularly, to an inductance device which comprises an outer conductor having a core of conducting material and a layer of magnetic material. An object of the invention is provide ways and means for using an inductance device of this kind for frequency changers, modulating devices such as used in radio work, etc. I

Other objects will be apparent from the I V following specification and claims when con sidered with my inve tion.

the accompanying drawing in' which, i 1

. Fig, 1 represents one 'embodi nent of my invention.

Fig. 2 represents another embodiment of Figs; aud t ments, and w I Fig. 5 is a cross-section, greatly enlarged,

represent further embodiof the novel conductor used in the invention.

This "application is an improvement over German application No. T29,196, filed in Germany on August 16, 1924, and filed in a the United States on August 14,1925, under Serial No, 50,165.

In the arent application a frequencyv changer a apted to short wave work has been disclosed, which consists of a conductor provided with a thin layer of aferro-mag- .netic or'any magnetic material, the said ferro-magnetic material, if desired, being placed directly, without an intermediate insulation layer, upon the non-magnetic con- .ductor.

Now, the present invention covers a further improvement upon the said frequency changer. It has been discovered that the 'frequency changer, as regards its power, is greatly dependent upon the temperature. Increase in heating generally increases the wet and the efl'iciency. More particuarly, it has been found that the most suitable temperature condition of the transformer or frequency changer depends both upon the supplied frequency as well as upon the useful and desired frequency in any given case.-

Inasmuch as the device is very sensitive to temperature variations, the chief point and idea underlying the present invention 1 nxcrcnmeiin FOB SHORT waves.

satin, and in Germany September is, 1924.

is to safe uard the-frequency changer from accident: external temperature influences,

.and to act upon its state of heating in the desired manner; in other words, by providing means adapted to adjust and regulate the same.

According to the invention, it is furthermore feasible to eliminate possibly existing harmful effects of the heating relative to the chemical properties of the material. Finally, the possibility of adjusting the heating state ad libituni on the one hand, and the sensitivity of the device to temperature variations, on the other hand, -.can be utilized for the object of-controllin the power thereof, i. e., for telegraphy' an work. i

The idea underlying the invention, consequently, resides, in the first place, in re ulating the temperature condition of the fi'etelephony quency changer in the desired, well-defined 4 manner.

Whenever the development of heat inside the device is such that t e heating required for maximum power is utomatically ad- 'usted, provided that all ex ernal accidental influencesliable to exercise Nisturbing effect are precluded, all that is necessary to do is to eliminate any such influence, For this purpose, the conductor constitutin the frequenc changer should most suitabi y be arrange similar to metal-filament lamps, inside a vacuous space, or, at any rate, within an atmosphere free from oxygen, the most referable arrangement of the conductor being bifilar or zig-zag. The absence of oxygen orthe provision of an atmosphere possessing properties neutral in chemical respe'ct, insures chemical stability for the material from which the apparatus is made. I

Referring first to Fig. 5, a conductor, as 1 disclosed in the above-mentioned parent.

application, is shown. It consists of a core of a non-magnetic conducting material 1,

such as copper and a layer of magnetic ma terial 2, such as iron, which is very thin.

Referring now to Fig. 1, a. -.frequency heat to produce by itself the desired hightemperature, according to the present in vention, the necessary heating 1s provided in an well known manner, electrically or by ot er-means, for instance, by hot gases or heating ovens. Most suitable for this purpose are currents of low frequency or direct current. The heating currents can be conducted into special radiators or heating bodies, but most simply into the coin ductor of the frequency changer itself.

\ One form of construction for such a device is diagrammatically shown in Fig. 2

by Way of example. The hi h frequency current flows through the biar conductor by way of lead-ins K K, through thebranches a (1 as well as through the branches (1 a, parallel to the former. Points l l equipotential with reference to the high frequencycurrent serve as leads for the heating current.

It may be mentioned, by the way, that it is not absolutely necessary for the supply leads l 1 to be equipotential; for if the circuit of the heating current is, per se, of sufficient impedance to the high frequency currents, or else, if for the same purpose a protective inductance 10 is arranged in series Withthe heating current source, the supply points I, 1, may be provided at any convenient point of the frequenc changer.

If, in connection with the arti cial heating of the frequency changer, external conditions happen to play an undesirable part, the device could also in such case be dis posed inside a vessel as in Fig. 1, such an arrangement being illustrated in Fig. 3.

The reference letters stand here for thesame elements and parts as in the preceding illustrations.

The energy of the frequency changer can be controlled or modulated by varying or interrupting the heating current, this being accom lishable directly, for instance, by the aid 0 the key t,-or else indirectly in any of the well known manners.

For instance, according to Fig. 4, the heating currents can be taken for the frequency changer c from a rectifier gsupplied from an alternating current source. and the said heating currents can, in well known manner, be modulated by regulation of the ignition current between electrodes 2 by the aid of a suitable device a which may consist either of a key or a telephone, to adapt them i to the uses of telegr'aphy or telephony work.

A source of directcurrent 11 is placed in series with device a andelectrodes 2.

In the case of especially high frequencies it is a suitable scheme to maintain the iron of the'frequency changer in incandescent, or nearly incandescent, state, especially in the neighborhoodof the critical'temperature of the iron. g

It should be notedthat the arrangement of the conductors a (1,, a, and a is that of a Wheatstone bridge.

Having described my invention, I am ontitled'to all modifications thereof that fall fairly within its spirit and scope as defined by the following claims:

v 1. In combination, an inductance device having a magnetic circuit and an electric circuit, both of said circuits being formed through a bi-filar conductor, a. source of energy connected with said circuits and means for controlling the output of said device by varying its temperature.

2. In combination, a bi-filar. conductor having a core of conducting material and a layer there around of magnetic material,

said core and said outer layer being of dif-.

ferent materials, a source of energy ..con-- .nected, with said conductor and means for controlling the output of said conductor by varying its temperature.

3. In combination, an inductance device comprising a plurality of conductors, each conductor having'a core of non-magnetic conducting material and a layer of magnetic material, said conductors arranged to form branches of a VVheatstone bridge said con ductors also being arranged bifilar fashion,

a source of highfrequency across diagonally opposite corners of said bridge, and a source of heating current across the other diagonally opposite corners for controlling the output of Said changer by varying its temperature.

4. In combination, an inductance device comprising a plurality of conductors, one. conductor having a core of non-magnetic" conducting material and a layer of mag- [netic material surrounding said non-magnetic conducting material, said conductors arranged to form branches of a Wheatstone bridge, a source of high frequency'across.

diagonally opposite corners of said bridge.

a Source of heating current across the other diagonally opposite corners for controlling the output of said changer by varying its temperature. 7 v

5. In combination, a frequency changer comprising a plurality of conductors, each conductor having a coreof non-magnetic conductingmaterial and an outer coating layer of magnetic material, said conductors arranged to form branches of a Wheats'tone.

bridge, with pairs of adjacent conductors being arranged bifilar fashion, a source of high frequency across diagonally opposite corners of said bridge, between the pairs,

a source of heating current across the other.

diagonally opposite corners for controlling the output of said changer by varying its temperature.

6. In combination, a frequency changer comprising a plurality of inductances, each of said conductors each having a core of nonmagnetic conducting material and a layer ofmagnetic material, all of said conductors arran ed to form branches of a Wheatstone bri ge, said pair of conductors also being arranged in bifilar fashion, a source- Of high frequency across diagonally opposite corners of said bridge, formed by the ends of said pair of conductors a source ofheating current across the other diagonally opposite corners for controlling the output of said changer bv varying its temperature.

8. In combination, an inductance device having a magnetic circuit and a non-magnetic electric circuit, both of said circuits being formed through a bidilar conductor, and means for adjusting the temperature of said device to any desired degree. 9. In combination, a conductor having a core of non-magnetic conducting material and a layer there around of magnetic material and means for adjusting the tern rature of said conductor to any desire degrec.

10. In combination, a hermetically sealed container, an inductance device having a magnetic circuit and an electric circuit in said container, said circuits being formed through a bi-filar conductor, said conductor having a core of non-magnetic. conducting material and an outer coating of magnetic material and means to adjust the temperature of said device to any desired degree 11. In'combination, a hermetically sealed container, a conductor having a core of nonmagnetic conducting material and a layer of magnetic material on said conductor.

12. In combination, a hermetically sealed container, a conductor-having a core of nonmagnetic conducting material and a layer of magnetic material there around in said container, a source of heating current traversing said conductor.

, 13. In combination, a hermetically sealed container, an inductance device having a ma etic circuit and an electric circuit in sai container, said circuits being formed through a bi-filar conductor, a regulated heating current traversing said electric circuit.

14, In combination, a hermetically sealed container, a conductor having a core of nonmagnetic conducting material and a layer of magnetic material there around in said container, an energy source connected with said conductor, a source of heating current traversing said conductor for controlling the output of said conductor by varying its temperature.

15 In combination, an inductance device having a magnetic circuit and an electric circuit, said circuits being formed through a conductor formed of two distinct materials, wrapped one over the other, said conductor being arranged bifilar, a vessel for hermetically sealing said conductor, a medium chemically inactive with said conductor contained in said vessel, and a heating source associated with said magnetic circuit for keeping the same in a state of incandesccnce.

16. In combination, a conductor having a core of non-magnetic conducting material and a layer of ma netic material thereon, and means for variadaly controlling the term perature of said conductor, said means including a source of heating current connected with said conductor, said source comprising a source of alternating currentenergy, a source of ignition current, and a rectifier connected to said sources.

17. In combination, a conductor wound bifilar fashion, a hermetically sealed vessel surrounding said conductor, a source of high frequency energy connected with said conductor, and a source of heating current connected with said conductor, said heating current being derived from a rectifier adapted to control the output of said conductor by which said conductor is heated.

18. In combination, a frequency changer comprising a pluarlity of conductors each comprising a core of non-magnetic conductvariably controlling the. temperature to ing material and a layer of magnetic material, a hermetically sealed body enclosing said conductors, said conductors being arranged within said body to form branches of a VVheatstone bridge with pairs of ad jacent conductors being arranged bifilar fashion, a source of high frequency across.

diagonally op' osite corners of said bridge,

a source of eating current across other diagonally opposite corners of said bridge,

and means for controlling the output of said changer by varying its temperature.

MENDEL OSNOS. 

